Necessity of rerunning catalog/catproc after import

With an upgrade planned this weekend, I have a question about my
proposed process. I am going from 7.3.4 to 8.1.6 . The new database will
be pre created with all necessary objects and catalog/catproc will be
run. Then import will be run to bring in the data.

The question is, do I need to rerun the catalog and catproc scripts? I
seem to remember that this shouldn't be harmful but I wouldn't bet on
it. So, is it recommended, a really bad idea, or not necessary at all?